58 
nitrogen balance per day was therefore as follows: Income in food 
9.87 grams; outgo in urine 4.81 grams, and in feces 1.64 grams; 
indicating a gain of 3.42 grams nitrogen, or 21.38 grams protein. 
This experiment was originally planned as a four -day test, but 
owing to the laxative character of the diet, which the subject attrib- 
uted to the prunes, it was deemed advisable to shorten it to three 
days. The subject noted that while this diet did not make him ill, 
it did cause him to feel very weak. Had a smaller quantity of prunes 
been used, perhaps the results would have been different. 
Notwithstanding this intestinal trouble and loss of body weight, the 
results indicate an appreciable gain of body protein. This is more 
important than the loss of body weight, which was presumably due 
to the loss of fluids occasioned by the diarrhea. 
DIGESTION EXPERIMENT NO. 412. 
Kind of food.— Dates, olives (pickled ripe), walnuts. 
Subject— C. P. H. 
Weight {with clothes). — At the beginning of the experiment, 63.5 
kilograms (140 pounds), and at the close. 64.1 kilograms (142 pounds). 
Duration. — Four days, with eight meals, beginning with breakfast 
March 11, 1902. 
Table 42. — Results of digestion experiment No. 413. 
Sam- 
ple 
No. 
Kind of food. 
Weight 
of ma- 
terial. 
Total 
organic 
matter. 
Nitro- 
gen. 
Pro- 
tein. 
Fat. 
Carbohydrates. 
Sugar, 
starch, Fiber, 
etc. j 
Ash. 
Heat of 
combus- 
tion. 
37 
Dates 
Grams. Grams. 
2,129 1,202.88 
908 j 228.88 
623 232.14 
Grams. 
9.20 
2.96 
9.71 
Grams. 
57.48 
18.52 
60.62 
Grams. 
6.39 
169. 41 
155. 20 
Grams. 1 Grams. 
1,094.30 44.71 
18.52 ! 22.43 
11.71 4.61 
Grams. 
27.68 
38.40 
Calories. 
4,957 
240a 
Olives 
1 752 
223a 
Walnuts 
4.74 j 1,800 
Total 
3,660 1,663.90 
21.87 
136.62 | 331.00 1, 124.53 | 71.75 
70.82 
8, 509 
112a 
Feces (water-free) 
Amount digested. 
Per cent digested. 
Energy of urine . . 
284.76 
255. 35 
1,408.55 
84.71 
8.79 
13.08 
59.81 
54. 92 
81.70 
59.81 
71.15 
259 55 
78.41 
108.52 20.46 
1,016.01 | 51.29 
90.35 71.48 
29. 41 
41.41 
58.47 
1,702 
6,807 
80.00 
102 
Energy of food 
oxidized in the 
bodv 
0,705 
Per cent of energy 
utilized 
78.80 
1 
During this experiment the subject eliminated 3,665 grams urine, 
containing 0.523 per cent or 19.15 grams nitrogen. The average 
nitrogen balance per day was therefore as follows: Income in food 
5.47 grams; outgo in urine 4.79 grams, and in feces 2.20 grams; 
indicating a loss of 1.52 grams nitrogen, corresponding to 9.50 grams 
protein. 
The subject believed the combination of dates, olives, and nuts to be 
an ideal fruit diet for him; and his physical condition and the fact that 
